Have the battery fully charged with a battery charger and then see
what happens. A battery won't drain in 7-10 minutes if the alternator is
faulty unless it isn't charged in the first place. Check the wiring to the
alternator and make sure everything is hooked up properly. Also have
the alternator checked to make sure it is indeed putting out power.
Even though its brand new it may have got fried with all the parts
changing and boosting etc.

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